Stop and repeat mechanism for phonographs



Aug; 27, 1929. J. T. SIBLEY STOP AND REPEAT MECHANISM FOR PHONOGRAPHS Filed March 25, 1924 4 Sheets-Sheet l Aug. 27, 1929. J. T. SIBL EY 1,726,128

' STOP AND REPEAT MECHANISM FOR PHONOGRAPHS Filed March 25, 1924 4 Sheets-Sheet 2 Aw. 27, 1929. T, IBL Y- 1,726,123

STOP AND REPEAT MECHANISM FOR PHONOGRAPHS Filed March 25, '1924 4 Sheets-Sheet 5 Aug 27, 1929; 1, SBLEY v 1,725,128

STOP AND REPEAT MECHANISM FOR PHONOGRAPHS Filed March 25, 1924 4 Sheets-Sheet 4 mum iiiinn Patented Aug. 27, 1929.

JAMES T. SIBLEY, OF NEW YORK, N. Y.

STOP AND REPEAT MECHANISM FOR PHONOGRAPHS.

Application filed March 25, 1924. Serial No. 701,683.

in my Patent No. 1,371,984, of March 15, 1921, I have shown and described a, mechanism, for automatically repeating the rendition of a phonograph record a predetermined or an indefinite number of times, with means for automatically stopping the motor when the desired number of renditionsor repetitions have been completed. The main principles of the mechanism involved in the patent have been preserved in the present instance; but certain parts of the prior mechanism have been improved, either for the purpose of manufacturing economy, or for more reliable operation. For example: the timing mechanism has been materially modified and improved friction means introduced; the clutch mechanism has been changed by the introduction of an elastic friction band so as to make it what may be called a slipping clutch and the repeating mechanism has been completely re-organized ana changed. Other features of improvement will be pointed out in the following detailed description in connection with the accompanying drawings, wherein Fig. 1 is a plan view of the, complete device, but with the tone arm removed and its position shown in dotted lines; also the circuit connections are shown in diagram.

Fig. 2 is a side elevational view, partly in section of the same, taken on line 22 of Figure 1.

3 is a plan, Fig. 4 a side elevation and 5 a vertical section of the differ.- entzal contact device, taken on line 5-5 of Fit) 3 (3 is a plan of the clutch. yoke and timing arm.

Fig. 7 an elevational view taken on line -7 of Fig. 1 of the clutch yoke, timing arm and worm gear. 1

8 is a sectional view taken on line VHTVTH of Fig. 9, and Fig. 9 is a plan view of the timing circuit closer.

Figs. 10 and 11 are respectively plan and side views, and Figs. 12 and 13 are views of the electro-magnet for tripping the one-revolution cam mechanism taken from. opposite ends.

Fig. 14 is a plan view and Fig. 15 an ole-rational view of the one-revolution cam mechanism and associated parts.

16 is a plan view and Fig. 17' an elevational view of the actuating cam lever.

My present invention is designed more particularly for use in connection with the electric motor shown and described in my above named prior patent; yet with very slight modification in the circuit connections it may be readily adapted for use with the ordinary spring phonograph motor.

The motor-driven spindle 1 projects some distance above the motor board 2, in position to receive and carry the usual turn table 8, which supports the disc record a. The board 2, in the present instance, is provided with a rectangular opening 5, which extends to the rear of the tone arm standard 6. 'A cast metal pan 7 of rectangular outline, is secured to theunderside of the board 2 by screws or bolts7, so as to close the opening 5, the bottom of the pan 7 serving as base or support for the tone arm standard 6, and also carrying the entire stop and repeat mechanism.

The frame of this mechanism consists of upper and lower frame plates 8 and 9, of general triangular shape, (see Fig. 1) connected together by three spacing posts 10, 11 and 12, each of which has its lower end threaded and extending through apertures in the bot-tom of the pan 7, with the nuts 13 thereon, to hold the frame firmly in place.

The plate 8 has a cup-shaped socket 14 to receive and retain ball bearings (not shown) for the spindle 1, which latter'has a spiral gear 15 rigidly secured thereto.

Upon the underside of the upper frame plate 8, see Fig. 19 and integral therewith, are the two journal brackets 16 and 17 which support two aligned shafts 18 and 19. The bracket 16 is partially internally threaded, and provided with an adjusting screw 20, having a pivot 21 at its inner end to enter a. corresponding socket in the end of the shaft 18-. The other end of the shaft 18 has a pivot 22 entering a corresponding socket in the adjacent end of the shaft 19, which corresponding clutch member 27, so that friction clutch.

when the two members 26 and 27 are engaged, the shafts 18 and 19 will rotate together in the same direction.

These two members may be formed as ongaging parts of a jaw clutch. or as a simple The rest of the clutch mechanism is of peculiar construction, designed to permit slipping engagement between its elements. It is made up as follows The member 27 is loosely mounted on the shaft 19 near its end to bear endwise upon a collar 28 fixed on the shaft end. Rigidly mounted upon the same shaft is a mating member 29, and the two members 27 and 29 are beveled or coned to form a V-shaped groove between them, 111 which groove an elastic ring 30, made of a coiled wire spring, is located. The friction of the ring in the groove affords sufficient resistance to cause the two shafts 18 and 19 to rotate together when the loose member 27 is pushed towards the fixed member 29 by the engaging clutch element 26; but when'the rotation of the shaft 19 is obstructed, as will be hereafter described, the shaft 18 may continue to rotate while the shaft 19 remains stationary.

Just inside of the journal bracket 23, upon the outer end of the shaft 19, is a bevel gear 31, in position for engagement with a segmental gear 32 integral with the lower part of the tone arm 33, and it will be seen that the swing of the tone arm will cause the shaft 19 to rotate. Normally, or while the tone arm is swinging across a record to re produce the same, its direction will be that of the arrow 34, causing the shaft 19 to rotate in the direction of the arrow 35. At the same time, the spindle 1 drives the shaft 18 (by the spiral gears 15 and 24) in the opposite direction. If the clutch members 26 and 27 are engaged, as will be hereafter described, the normal rotation of the spindle 1 will cause a reverse swing of the tone arm.

The hub of the member 29 carries a spiral gear 36, which engages a similar gear 37, fixedly mounted in an insulated bushing 38, see Figs. 3, 4 and 5 upon the other end of the bushing 38 is a metal socket 39 having a pivot cup 40, to receive an insulated pivot 41, projecting up from the bottom plate 9.

' A corresponding pivot pin 42 is ad ustably set in the top plate 8 in alignment with the pin 41, and its point sets in a pivot cup in the upper end of the shank of the gear 37. The metal socket 39 has two opposed radial arms 43, and 44, upon which an eccentric floating weight 45 is mounted for a very limitedrising and falling movement.

Upon the outer, straight edge of the weight 45 is a radially projecting pivot pin 46, upon which a contact rocker 47 is pivotally mounted. This rocker consists of a strip of metal 48 folded upon itself and provided with a socket 49 near its bent end to adjustably receive a screw-threaded contact point 50.

Between the other ends of the strip 48 is secured a block of insulating fibre 51, having a contact cusp 52, serving as a tilted edge and a friction lobe 53, arranged on opposite sides of the pin 46, the cusp being located but slightly ahead of the center of the pin, so that when allowed to rest upon a horizontal surface, the rocker will support the weight 45 through the pin 46, upon the cusp 52 and lobe 53, with the contact point 50 clear of the supporting surface.

Movement of the weight 45 in the direction, of the arrow 54, will not affect the relative position of the point 50 with respect to the surface; but movement of the weight in the opposite direction, or stopping of the movement of the weight and advancing the surface in the direction of the arrow, will at once cause the cusp 52 to dragupon the surface and tilt the rocker until the point touches the surface. This surface consists of the face of metallic gear wheel 55, mounted to rotate upon an insulating bushing 56, through which the pivot pin 41 is inserted, and the under face of the gear rests in metallic contact with the upper face of the lower plate 9.

Mounted in hearings respectively in the upper and lower plates 8 and 9 is a shaft 57, having a worm wheel 58 rigidly mounted thereon for engagement with the worm 25 on the shaft 18. A pinion 59 is rigid upon the lower end of the shaft 57 to engage and drive the gear 55. Therefore if the spindle 1 is rotated, and the tone arm is simultaneously carried across the disk record, as in playing a record, the worm 25 on shaft 18 will slowly rotate the worm wheel 58, shaft CIl Conditions, the weight 45 and its contact rocker 47, travel slightly faster than the gear 55, so. that the cusp 52 and lobe 53 drag upon the surface of the gear keeping the point out of contact.

If, the speed of the weight 45 and its rocker 47 falls below that of the gear 55, at once the drag of the gear 55 upon the cusp 52 will rock the point 50 into contact with the face of the gear 55. This is just what takes place when the swing of the tone arm ceases, as for example, when the sound box needle reaches the end of the record groove. 1

Referring now to Figs. 1, 14 and 15, a spiral gear is loosely mounted upon the shaft 61, between the plates 8 and 9, to be driven by the spiral gear 24, above referred to.

The gear 60has a series of apertures 62 annularly arranged near its center. And mounted on the shaft 61, beneath the gear 60, is a locking clutch member 63, having an oval cam 64 at its upper end, and at its lower end an arm 65, to support a trip lever 66.

The inner end of the lever 66 is slotted to enter an annular groove in a vertically sliding bolt 67, which is guided in apertures in the arm 65 and cam 64 to register with and enter the apertures 62, as hereafter described. The lever 66 has the spring 68 bearing upon its underside, its normal tendency being to set the bolt 67 in some one of the apertures, and when so set, the clutch member 63, with its oval cam 64 will be locked to and rotate with the spiral gear 60, causing the free end of the lever 66 to sweep around a complete revolution.

Located in the path of the outer end of the lever 66 is a cam 69, rigidly mounted upon a pivoted armature 70, see Figs. 10 to 13 supported upon a bolt 71, passing through and securing the pole-piece of the magnet 7 3 normally holds the armature away from the other pole-piece 72, so that the cam 69 will engage and trip the lever 66, unless it should be withdrawn from the path of said lever. Upon energizing the magnet 72, the armature 7 0 and cam drawn, and the spring 68 will operate. the lever to set the bolt into one of the apertures in the gear 60. I

Fulcrumed upon a shaft 74, see Figs. 16 and 17, is a lever 7 5, one end of which carries a roller 76 which rides uponv the periphery of the cam 64, see Figs. 1 and 1 and drops into a notch 77, located at the extremity of the long radius of the cam at the moment when'the trip lever 66 has ridden about midway of the cam 69,,at which point the lever 66 will have freed the bolt 67 from one of the apertures 62 in the gear 60. A coil spring 78 surrounds the shaft 74,

72 to the bottom plate 9. A spring 69 will be so with-- one of its ends bearing upon the spacing post 11 and its other endset into one of the adjusting notches 7 9 in a lateral 1promotion 80 from the side of the lever 75. xtending through an aperture 75. in the right angularly twisted opposite end of the, lever 75, is a pull-rod 81, connected with a chain or cable 82, see Fig. 1 and Fig. 2, which passes over direction pulleys- 83 and 84, within the 1 balance this tension in some measure, so as to'permit other functions to, be performed, a tension spring 88, see Figs. 1 and 18, is connected to the rod 81 at 89, and adjustably connected to the upper frame plate 8 through a slot 90, by a rod 91 and its binding nut 92. The clamp at 89 may be adjusted along the rod 81 to obtain an'initial adjustment, and afterward the projecting end of the rod 91 moved along the slot 90v and secured in finally adjusted position by the nut 92.

Pivoted in the upper and lower frame plates 8 and 9 is a shaft 93-, see Figs. 1, 6 and 7 upon which a clutch yoke 94 is mounted, with its yoke arms extended into a-groove 95 in the clutch member 26. A push rod 96 is connected to. the lever 75, and extends loosely through the yoke '94sand is bent to form a sort of hook 97 by whichthe yoke is positively pulled back by the return movement of the lever 7 5. The rod 96 extends some distance beyond thebend 97 with its end 98 bent back into alignment with the rod, for a purpose to be hereinafter described. A coiled compression spring 99 encircles the rod 96 between a fixed collar 100 and the. face of the yoke 94. The movement of the lever 75, under the action of the cam 64 and the spring 78, is thus communicated to the yoke 94, which in, turn shifts the clutch member 26 into and out of engagementwith the member27.

Since a proper correlation of the parts is necessary in order that they may all function attheir appointed times, and hold the parts in engagement until all have performed their respective functions, a timing mechanism is introduced in connection with the clutch yoke.

Upon a shaft 93' is the trip lever 101, formed of sheet metal into U-shape and provided with an arm 102, which extends into alignment with the end 98 of the push rod 96, the construction being such that when the rod isreciprocated by the lever 7 5, the trip lever 101; will be pushed forward with it. Pivoted at 103 upon the trip lever 101, is the time arm'104, which extends diagonally forward and has a segmental rack 105 at its free end, in position to engage a small pinion 106, mounted upon the worm wheel shaft 57.

An off-set stop 104 projects from the end of the arm 104, to engage the hub of the worm wheel 58, to limit the movement of the time arm. Surrounding the pivot 103 is a coil spring 107,-oneen'd of which is hooked over the forward edge of the arm 104 and the other end bears upon the inner face of the lever 101, and its tendency is to swing the arm 104 in the direction of the arrow 108, see Figs. 6 and 7; but when the rack 105 is in engagement with the pinion 106, the arm 104 will be carried in the opposite direction.

With the parts as shown in Fig. 1, the time arm 104 has been carried to the limit of its stroke by the pinion 106 and if the lever is now operated to draw the rod 96 forward to set the clutch member 26 against the member 27, the end 98 will engage and push the arm 102 forward, thereby carrying the time arm 104 with it and carrying the rack 105 out of engagement with the pinion 106. The coil spring 107 will then swing the arm 104 back until the arm 104' strikes the hub of the worm wheel 58 and stops its further movement.

When the lever 75 again pulls the rod 96 back to its original position, the time arm 104 and its rack 105 will again be pushed forward with the rack in engagement with the pinion 106 which is loosely mounted upon the shaft 57, and provided with an in tegral cone 109; a similar cone 110 is provided upon the pinion 59, so as to form a V-shaped groove between them, in which the elastic ring 111' of coiled wire located in all respects like the friction device on the shaft 19 as above described. The continued rotation of the shaft 57. therefore. can only rotate the pinion 106 until such time as the resistance offered to the further movement of the rack 105 shall overcome the friction of the ring 111 upon the cones 109 and 110.

The movement of the time arm 104, as thus described, is utilized to close a circuit breaker mounted upon the lower plate 9 the same consists of aninsulating base block 112, secured to the under face of the plate 9, see Figs. 8 and 9 and provided with a central, rectangular opening 113. Upon the lower face of the block 112 is secured'an L- shaped strip of sheet metal. 114 having a pair of upturned bearing arms 115 and 116, projecting through the opening 113, between which, a triangular insulating block 117 is pivoted at 118. i

The arm 115 has a lug 119 at its upper end, bent around to form a limiting stop for the block 117. At the opposite end of the .130, guided by its opening 113, and upon the lower face of the base block 112, is a metal contact strip-120, extending from the insulated pivot 41, to which it is securedby the nut 121, and having its other end located between the lower end of the block 117 and the upper face of the strip 114, and bent to bear flatly upon the under edge of the block 117, normally out of contact with the strip 114 so that upon the tilting of the block 117, the free end of the strip 120 will be bent down into contact with the strip 114.

The upper end of the block 117 extends up into the path of the arm 104, so that when the rack 105 engages and is moved by the pinion 106, the arm 104 will tilt theblock 117 thus moving the strip 120 into metallic contact with the strip 114. The resistance offered by the block 117 when such contact s complete is sufficient to arrest the further movement of the arm 104 and rack 105, causing the pinion 106 to slip or turn upon the shaft 57, as above described.

In conjunction with the above described mechanism is the setting mechanism, whereby the device may be set to repeat one, two or more times or to repeat indefinitely so long as power is supplied to the driving motor. The mechanism includes the following parts: a strip of insulating material 123 see Figs. 1 and 20 is fastened to the bottom of the pan 7 by screws 124. Upon this strip is secured an l..-shaped metal contact strip 125, the upright part of which projects up into position to be engaged by a contact bar 126, pivoted upon. a post 127. The contact bar has a laterally and upwardly projecting arm 128 at one end and a cam roller 129 at its other end.

Adjustably secured to the pull rod 81, by means of the clamp 130 and the adjusting belt 130 is a laterally extending cam plate forked arms 131 and 132, 151 a groove in the post 133 which projects 110111 the bottom of. the pan 7. Upon the edge of the cam plate 130 is a cam 13 in position to engage the roller 129, and when therod 813 s pulled to its forward limit by the dropping of the sound box, as heretofore described, the cam 134 will engage the roller 129 and push the bar 126 out of contact with the l..-shaped contact strip 125.

Mounted by screws 135 upon the segmental 32 at the base of the tonerarm 33 is a cut-out arm 135 which has a cam-arm 136 extending around in position to engage the upper end of the arm 128 when the tone arm 33 is swung around into initial position, that is, clear of the turntable, and when this takes place, the contact bar 126 will be moved away from the contact strip to break the electric circuit at that point, and stop-the motor, as will be explained later.

In order to arrest the tone arm before it reaches its initial position clear of the lowered upon the face of a recor'd.disc, -so

that the playing of the. same may be re peated, the cut-out arm 135 is provided with a downwardly projecting ledge 137, which is in position to engage an upwardly projecting post 138 on the outer end of a lock arm 139, pivotally mounted upon a post 140 fixed in the pan 7. p

Connected to an outer end of the lock arm 139 is the arc-shaped lockingrod 141, which extends freely through an aperture in a locking bar 142 pivoted upon a p0st 143 fixed in the pan 7. The bar 142 has a lateral arm 144, from which a coil spring 145 extends to and is connected with the lock arm 139, the structure being such that when the free end of the bar 142 bears against the post'140, the aperture in the bar will be cramped against the locking rod 141, the two parts will be locked together, and thus form an abutment of the post 138 against which the ledge 137 is arrested when the tone arm is swinging 110- ward initial position.

When the bar 142 is moved away from the post 140, the cramping of the aperture about the rod 141 will be eased, and the rod will be free to move transversely through the locking bar as the ledge 137 engages the'post 138,and thus the tone arm is permitted to swing to its initial position. The means for so moving the bar 142 consists of a small V-shaped cam 146, attached by a screw 146 to the face of a mutilated ratchet wheel 147 mounted upon the post 140 and when the ratchet is'rotated clockwise, the cam will engage the end of thebar 142'and wedge it away from the post 140, v

The means for rotating the ratchet 147 step by step consists of a repeat pawl 148, formed of sheet metal having a hook 149 upon its outer end, and guided upon the post 133 in position to permit the hook 149 to engage a tooth of the ratchet 147 each time the'pawl is reciprocated.

A pull rod 150 connects the pawl 148 with the lever 75, so that each time the lever moved as heretofore described, the pawl will be drawn backward and its hook will engage and turn the ratchet onestep. The ratchet may beset by hand so that it must he stepped ahead one, two or more times before the V-cam 146- will engage the end of the bar 142; or it may be set around to the point where the cut-away part 147 of the ratchet will be adjacent to the path of the hook 149, when, of course, the reciprocation of the pawl 148'will not affect the ratchet, and so long asthe locking bar is locked, the tone arm will swing back only to initial playing position, and the record will be repeated indefinitely, orso long as power is supplied to drive the motor.

In order that the ratchet may be held from turnmg against any jarring movement, there is mounted upon the post 133 an arm 151, with a roller-152 in the end thereof in pos tion to ride upon theteeth of the ratchet,

or rest upon the points of two adjacent teeth. Upon the arm 151 is a laterally .proj ecting arm against the ratchet 147. a The arm'151 may 153, from which a tension spring 154 leads to a contact bar 126, thereby be provided with an angularly disposed extension 155 in position to engage the roller 129 on the contact bar 126, so that when the roller 152 drops into the notch 147, the arm 151 will swing sufiiciently to cause its extension 155 to bear upon the roller 129, and push the bar 126 away from the strip 125- and so break the electrical connection at that point.

The electrical connections and wiring diagram, when the phonograph is driven by an electric motor such as set forth in the mentioned patent, are as follows The battery B is composed of six dry cells located in the phonograph cabinet. "The lead out wire a connects one battery "terminal with the motor M, from which the ,wire

2') leads to a plate 0 upon the insulation 1;

thence the wire d leads to and is connected to'the pan 7 at c.- The wire'/' leads from the other battery terminal to a plate 9 upon the insulation 1, from which the wire it leads to the contactstrip 125' The circuit is come pletecl from the strip 125, through bar 126, post 127, pan 7 back to the wire connection at a; 'When thebar 126 is moved away from the end of the strip 125 by any of the agencies above described, this circuit will be broken, and of course, the motor will stop.

The branch circuit for operating the stop and repeat mechanism is'as follows The wire 7: is tapped; from the wire and leads to a plate in upon the insulation II, from whichthe wire Z leads to the magnet 72, with the wire m leading therefrom [to plate 7 upon the insulation I; thence wire 0 leads to the strip 114. The circuit is coinpleted through the contact strip 120, insulated pivot 41, socket 39, arms 43, 44, weight 45, point 50, gear 55, plate 9, pan 7, post 127, bar 126, strip 125 and so back to the other battery terminalas above described lows The position of the parts as shown in Fig. 1,'isthat assumed when the sound box is at the beginning of the record. The soundbox and tone arm are propelled across A wire 29 may lead from the plate 111 the record as the needle follows the record groove, and the movement of the tone arm is communicated to the differential contact point and rocker 47 through the gears 32, 31, shaft 19 and'gears 36, 37. At the same time the gear is being driven a trifle slower'than said rocker, bythe shaft 18, worm 25, worm wheel 58 and pinion 59, so that the point 50 is held out of contact with the gear 55. I

When the end of the record is reached, the sound box and tone arm cease to advance, with a consequent stopping of the shaft'19 and the differential contact mechanism which is driven thereby. But the continued rotation of the gear 55 drags the rocker 47, and point 50 contacts with the face of the gear 55, thus closing the branch circuit above described through the magnet 72, which will then trip the cam 69 from beneath the lever 66, and thus set the cam 64 in locked relation with spiral gear 60.

j The roller 7 6, riding upon the periphery of said cam, will now swing the lever 75 into the dottedline position, operating the push rod 96 to set the'clutch members 26 'and27, and operating the pull rod 81 to elevate' the sound box section 85. The clutch .rnembers 26 and 27, having connected'the shafts 18 and 19 together, the tone arm is now swung back to initial playing position, which is fixed by the position of the post 138 on the lock arm 139, and thecontact of the ledge 137 therewith. If at this point the cam'64has not yet completed its revolution, and the lever 75 has not acted to open the clutch members 26, 27, the slipping engagement of the parts 27, 29 and 30 will ermit the continued rotation of the shaft 18, without affecting the shaft 19.

h In the mean time, when the clutch push rod 96 is actuated by the lever 75, the end 98 will press against the arm 102, and thus move, the trip lever 101 about the shaft 93, which will carry the time arm 104 and its rack 105 out of engagement with the pinion 106; whereupon the spring 107 will swing the time arm 104 into the position shown in Fig. 6, and out of contact with the block 117, see Fig. 8. r

The spring end of the strip 120, being reliev'ed of the pressure of the block will break contact with thestrip 114, thus opening the branch circuit which includes the magnet 72, whereupon the armature will spring back and carry the cam 69 into the path of the slowly approaching cam lever 66, which upon riding up on the, same cam, will draw the bolt 67, and unlock the cam 64 from the spiral gear 60. v

This takes place at the time the. long radius of the cam with its peripheral notch 77 reaches the roller, and the lever is back to its starting position, as shown in Fig. 1. As the lever gradually approaches this starting position, the pull rod 81 gradually cedes and permits the sound-box section to lower gradually upon the record, and

when the needle engages a record gr0ove,

the operation is repeated. 7 r

If the sound box section 85 is permitted to drop below the level of theturntable, the

pull rod 81 will have a correspondingly longer movement, which will be accompanied with the movement of the cam plate 130 and its cam 134, which will move the contact bar of course is only when the reverse swing of.

the tone arm is unobstructed by the lock arm 139 and its post138. The step by step movement of the ratchet 147 by the reciprocation of the pawl 148, will as above de-' scribed, bring the cam 146 into position to unlock said lock arm.

I claim: 7

1. In a phonograph, the combination with a rotating spindle, and a horizontally swinging tone arm ,of a shaft driven by said spindle, a second shaft aligned therewith and normally driven in a direction opposite to that of said first named shaft, means for coupling the adjacent ends of said shafts together to produce a reverse swing of said tone arm, said means comprising a clutch member splined to said spindle driven shaft, a pair of clutch members on the tone-arm driven shaft, one being loosely and'slidably mounted at its end and formed asa mate to the adjacent spindle driven clutch mem- I her, the other fixedly mounted, on the shaft in proximity to the loose member and in termediate resilient means to frictionally couple said pair of clutch members to serve a joint drive of said shafts, when the mating members at the shaft ends engage and to permit a slipping engagement and hide pendent rotation of said shafts, when the torque on the two coupled shafts exceeds a moderate force. I

2. In a phonograph, the combination with a horizontally swinging tone arm having a vertically movable sound box at its free end, and a motor driven turntable carrying a sound record thereon,-of means actuated by the cessation of the swing of the tone arm due to the completion of the playing of the record to elevate. the sound box from the record and swing said tone arm to its initial playing position to stop the motor, means for interrupting said reverse swing before said initial position is reached, said 7 projecting ledge upon the'base of the tone arm in position to engage and be. stopped by a part of said lock arm, and adjustable means, actuated by the cessation of the swing of the tone-arm, to unlock the lock arm and thereby automatically to remove the part engaging and stopping the projecting ledge on said tone-arm.

3. In a stop and repeat mechanism for phonographs, the combination with a motor driven turntable carrying a sound record and a horizontally swinging tone arm having a vertically movable sound box at its free end, of a laterally projecting and townwardly extending ledge upon the base of said tone arm, a pivoted lock arm having its free end adapted to swing into the path of said ledge, means for locking said arm whereby the engagement of said ledge therewith will arrest the lateral swing of said tone arm, before it has cleared the sound record, and means to unlock said arm, whereby the tone-arm can push the lock arm aside by means of said ledge and complete its swing across the sound record.

4:. In a stop and repeat mechanism for phonographs, the combination with a vertical post, of a ratchet wheel adjustably mounted upon said post, a reciprocating pawl having a single tooth in position for engagement successively with the teeth of said ratchet interconnecting means, actuated by the repeat mechanism to operate said reciprocating pawl, a laterally projecting lock arm pivotally mounted upon said post, and adapted to arrest the swing of the tone-arm of said phonograph mechanism, a locking rod connected to the outer end of said lock arm, a locking bar pivotally mounted adjacent to said locking rod and having locking engagement therewith, and a cam upon the face of said ratchet wheel in position to engage the free end of said locking bar to unlock the same from said locking rod, whereby said locking rod and lock arm may freely swing about said post, and thus clear the path of the tone arm.

5. In a stop mechanism for phonographs, the combination with a rotatable ratchet wheel, of a \l-shaped cam upon the face of said wheel, a reciprocating pawl for engagement with the teeth of said ratchet wheel to move the same step by step, means actuated by the driving part ofthe mechanism, to operate said reciprocating pawl, a lock arm carrying a locking rod pivotally mounted concentric to said ratchet wheel, and a locking bar pivotally mounted adjacent to said ratchet wheel and having looking engagement with said locking rod, its free end being in position for engagement with said cam upon the rotation of said ratchet wheel whereby said bar may be unlocked from said rod to permit the free rotation of said lock arm.

6. In a phonograph, the combination with a motor driven spindle having a record receiving turntable, and a tone arm movable over said turntable, of means for actuating said tone arm, said means comprising a sectional shaft, clutch elements fixed upon the adjacent ends of the sections of said shaft, said elements having oppositely bevelled faces to present a V-shaped groove therebetween, and an endless helical spring band disposed in the mentioned groove, adapted to serve as an intermediate frictional coupling between said clutch elements.

7. In a phonograph, the combination with a motor driven spindle having a record receiving turntable, and a tone arm movable over said turntable, of means for actuating said tone arm, a given number of times, and means for restraining the action thereof, said restraining means comprising a ratchet wheel having a recess in its periphery, a reciprocating pawl engageable with one tooth of said ratchet at each reciprocation, means in connection with the motor driven spindle, to actuate said pawl means for manually adjusting said ratchet to present one or more teeth for pawl operation, a cam on said ratchet, a pivoted lever having its free end disposed in the path of said cam, and a mechanism locking means controlled by the movement of said lever.

8. In a phonograph, the combination with a motor driven spindle having a record receiving turntable, and a tone arm movable over said turntable, of means for actuating said tone arm, a given number of times, and means for restraining the action thereof, said restraining means comprising a ratchet wheel having a recess in its periphery, a reciprocating pawl engageable with one tooth of said ratchet at each reciprocation, means in connection with the motor driven spindle, to actuate said pawl, means for manually adjusting said ratchet to present one or more teeth for pawl operation, a cam on said ratchet, a pivoted lever having its free end disposed in the path of said cam, means controlled by said lever for stopping the driving iechanism of said spindle, and a spring pressed roller engageable in the recess of said ratchet permitting continuous operation of said mechanism.

JAMES T. SIBLEY. 

